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Low-voltage high power multi-branch three phase asynchronous motor

A three-phase asynchronous, high-power technology, applied to the shape/style/structure of the winding conductor, can solve the problems of low voltage, low representativeness, high power, etc., achieve reliable working performance, avoid instability, prolong The effect of longevity

Inactive Publication Date: 2010-06-02
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the inverter cooling problem caused by its lower voltage level has not been solved
The invention patent (Patent No.: 200320111621.4) applied in 2003 for "Low Voltage High Power Wound Rotor Motor for Lifting and Metallurgy" is characterized by its low voltage and high power, suitable for driving various medium and large overweight equipment, and has a relatively Large overload capacity and high mechanical strength, but its winding rotor has great limitations in industrial production, the representativeness is not strong, and it is still limited by the limit current of the motor
The above inventions are all limited to the improvement of the structure and performance of the low-voltage high-power asynchronous motor itself, and have not fundamentally solved many unfavorable factors caused by the limiting current of the low-voltage high-power asynchronous motor

Method used

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  • Low-voltage high power multi-branch three phase asynchronous motor
  • Low-voltage high power multi-branch three phase asynchronous motor
  • Low-voltage high power multi-branch three phase asynchronous motor

Examples

Experimental program
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Effect test

example 1

[0019] The low-voltage high-power multi-branch three-phase asynchronous motor consists of a machine base 9, a left bearing outer cover 1, a left bearing inner cover 2, a left bearing sleeve 3, a left end cover 4, a left bearing 5, a stator 6, a rotor 7, a junction box 8, Right bearing outer cover 10, right bearing inner cover 11, right bearing sleeve 12, right end cover 13, right bearing 14, fan cover 15, left bearing outer cover 1 and left bearing inner cover 2 are installed on the left bearing sleeve 3 by bolts, The left bearing sleeve 4 is installed on the left end cover 4 with bolts, the left end cover 4 and the junction box 8 are respectively installed on the machine base 9 through bolts, the left bearing 5 is installed on the rotor 7, the stator 6 is directly installed on the machine base 9, and the rotor 7 Through left bearing outer cover 1, left bearing inner cover 2, left bearing sleeve 3, left end cover 4, left bearing 5, right bearing outer cover 10, right bearing in...

example 2

[0022] The electromechanical structure is the same as Example 1, in which the star-shaped three-phase sub-winding is equal to the number of poles of the motor.

example 3

[0024] The electromechanical structure is the same as Example 1, in which the star-shaped three-phase sub-winding has three times the number of poles of the motor.

[0025] The present invention is powered by a power frequency power supply, such as Figure 4As shown, the low-voltage high-power asynchronous motor is mainly controlled by the contactor KM to control the power on and off of the three-phase winding 1-8, so that the working three-phase winding and the motor load can achieve the best match, and the reduced motor current protects the drive system. The role of the contactor, the contactor KM can also be controlled by CPU technology such as PLC (or single-chip microcomputer).

[0026] In the frequency conversion speed regulation system of the present invention, Figure 5 Reasonably configure general-purpose low-voltage frequency converter VVVF according to requirements, and the quantity and type of general-purpose low-voltage frequency converters should be reasonably s...

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Abstract

A low voltage, high power and multi-branch three-phase asynchronous motor belongs to the motor technical field; the motor includes a base, a stator winding, a rotor, a junction box and a fan housing;the stator winding is composed of a plurality of star three-phase windings, which can generate revolving magnetic field, work independently, drive the rotor to revolve, and are distributed on the stator symmetrically; the three-phase leading-out wire of each winding is connected with the terminal in the junction box arranged on the asynchronous motor body, electrically connected with an output terminal, a contactor, a frequency converter and a three-phase power supply in order in the junction box which is connected with the winding, to form a power supply parallel circuit which can be controlled solely. The advantages of the motor are as follows: the problem that the low-voltage high-power frequency converter in the frequency conversion speed regulating system is cooled difficultly is solved; when the load of the motor is reduced, the working parallel branch can be changed alternately, which prolongs the useful life of the motor and the contactor; the motor has the advantages of improving work efficiency of the system, saving energy, etc.

Description

technical field [0001] The invention belongs to the technical field of motors, is a low-voltage, high-power multi-branch three-phase asynchronous motor, and relates to a main drive motor for large mechanical equipment. Background technique [0002] Medium and large asynchronous motors are mainly used as the main drive motors for mechanical equipment in mining, petroleum, chemical, electric power, water supply and drainage systems. In order to reduce the current, the voltage level above 1kV is usually used. This voltage level not only brings many problems to the design, manufacture and maintenance of the motor, but more importantly, for the transmission system that requires variable speed and energy saving, the corresponding high-voltage inverter is very expensive, and its performance and reliability are far inferior to low-voltage inverters. . If a low-voltage high-power asynchronous motor is used, the existing problems are mainly: the excessive current of the motor will ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K3/28
Inventor 冯桂宏张宥张炳义李硕
Owner SHENYANG POLYTECHNIC UNIV
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